MS-Teams Application is crashing in mobile , desktop and via web also

Hi @Nayak, Lukesh (external),

Thank you for reporting the issue. If Microsoft Teams is crashing across mobile, desktop, and the web, and you’re unable to join any meetings, this exposes a potential service-side issue or an account/tenant-level problem, rather than a single device or application fault.

Due to the nature of this issue, there are unfortunately limited steps that end users can take directly. The most effective next step is reaching out to your IT admin and ask them to use their admin credentials to submit a support request through the Microsoft 365 Admin Center.

Microsoft also provides customer service phone numbers based on your region. You can find the appropriate contact number here: Customer service phone numbers - Microsoft Support 

This route ensures that a Microsoft support engineer can initiate a remote session to investigate backend configurations, run advanced diagnostic tools, and, if necessary, escalate the case to specialized teams with access to internal systems and logs. These backend resources are essential for resolving issues that go beyond what’s visible in the user interface.

As community moderators, we’re here to guide you, but due to privacy and security limitations, we don’t have access to the backend tools required for a full resolution. For this reason, contacting Microsoft Support via the Admin Center is the most secure and efficient way forward.

I hope this helps you resolve the issue quickly. I’m glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.  

If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.  

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MS Teams crashing on mobile, desktop, and web suggests either account/policy issues or environment/device problems rather than a single client bug. Use these steps to isolate and mitigate:

1. Check if this is tenant-wide or user-specific

• Test with another user account in the same organization.
• Test joining the same meeting with a personal account (if allowed) or from outside the organization.
• If multiple users in the org are affected, contact the organization’s IT admin to review Teams policies, security settings, and any recent changes, especially around meeting security, verification checks, and Teams for Education policies if applicable.

2. Verify the meeting itself

• Confirm the meeting is actually a Teams online meeting and not just a calendar entry:
  • If organizer: open the meeting in the Teams calendar and ensure the Teams meeting toggle is turned on.
  • If attendee: ask the organizer to confirm it was created as a Teams meeting and to resend the invite if needed.
• If the organizer has enabled strict security (for example, end-to-end encryption or verification checks), confirm that external participants are allowed and that the meeting isn’t restricted to the organizer’s organization only.

3. Try alternative join paths

• Join directly from the Teams calendar instead of the invite link.
• Join by link as documented in “Join a meeting in Microsoft Teams”: click the meeting link and choose to open in the desktop app or web.
• If using a phone or tablet, avoid mobile browsers (not supported for meetings); install and join using the Teams mobile app instead.

4. Address client crashes on desktop If the desktop app exits unexpectedly when trying to join meetings:

• Ensure antivirus/DLP tools are not blocking Teams or Microsoft Edge WebView2 processes. Follow guidance in “Prevent antivirus and DLP tools from blocking or crashing Microsoft Teams” referenced under Teams client crash resolution.
• Enable Windows Error Reporting (WER) so admins can see crash details and, if needed, share with Microsoft Support.
• Make sure audio and video drivers are fully updated, as media stack failures can cause crashes when joining calls.
• If crashes persist, fully uninstall Teams and remove leftover Teams data under the user profile (AppData) before reinstalling, as described in the Q&A example where removing residual Teams files under AppData resolved repeated crashes.

5. Address client crashes on mobile

• For Teams for Education or work accounts on mobile, follow the same basic troubleshooting:
  • Force-close the app and reopen.
  • Clear the Teams cache and app data.
  • Ensure the OS and Teams app are fully updated.
  • If still failing, uninstall and reinstall the Teams app.
• If the issue is specific to a platform version (for example, a known Android issue), the device vendor or OS provider may need to fix it; in similar cases, escalation to the platform provider resolved the crash.

6. Use Teams on another platform as a test

• If desktop is failing, try https://teams.microsoft.com in a supported browser.
• If web is failing, try the desktop or mobile app.
• For education tenants, if one platform fails, Microsoft guidance is to try another (desktop, web, or mobile) to confirm whether the issue is platform-specific.

7. If Teams for Education is involved

• Many capabilities and access (including meetings) are controlled by the institution’s IT admin.
• Ask the IT admin to verify:
  • Licenses are valid and assigned.
  • Meeting policies allow joining and aren’t blocking users.
  • Teams is up to date and not restricted by school policies.

8. When to escalate

• If multiple users, multiple devices, and multiple networks all show crashes or failures to join:
  • Admins should review the Teams client health dashboard (when available) for client crash insights.
  • If antivirus/DLP exclusions, driver updates, reinstall, and cross-platform tests do not resolve the issue, open a support case with Microsoft Support and provide WER crash reports and event logs.

While working around the issue, joining by phone dial-in (if enabled in the meeting invite) can provide temporary access to audio even if the app is unstable.

References:

• I can't join a meeting in Microsoft Teams
• Join a meeting in Microsoft Teams
• Resolve Teams "client crash" issues
• Teams for Education is not working
• Require verification checks to join Teams meetings and webinars in your org
• Teams continuously crashing in WIN 11 - Microsoft Q&A
• Teams keeps crashing and restarting after updating to version 25332.1210.4188.1171 - Microsoft Q&A
• Teams keeps crashing and reloading - Microsoft Q&A
• When I try to open Teams meetings from a link in my Google Calendar, the meeting never loads. - Microsoft Q&A
• Teams app on Android crashes right after opening - Microsoft Q&A